| LIU Weiqi,NISHIZAWA K.Measurement and evaluation of the 14C concentration in the collagen of the teeth among the Chinese[J].Chinese Journal of Radiological Medicine and Protection,2000,20(5):330-333 |
| Measurement and evaluation of the 14C concentration in the collagen of the teeth among the Chinese |
| Received:December 10, 1999 |
| DOI： |
| KeyWords:Tooth 14C Concentration Nuclear weapon Environmental pollution |
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| Abstract:: |
| Objective The concentration of 14 C in the collagen of the teeth among people with different ages was measured to understand concentration of 14 C in the environment and human body of China influenced by 14 C produced by nuclear weapon tests in the world in the past decades. Methods Forth eight eighth permanent teeth of some Shanghai residents born from 1920 to 1977 were collected. The teeth were cleaned and decalcified for the extraction of collagen and then were oxidized by high temperature and reduced into carbide graphite. The 14 C was measured using an accelerator mass spectrometer (AMS),and the concentration of 14 C was obtained by correction of 13 C. Results The concentration of 14 C in the collagen of the teeth showed apparent variation in people born in different years:those born before 1940 around the level of background and those born from 1941 gradually increase,those born 1951 reached the peak value-580‰,those born after 1951 presented a tendency of decrease. Conclusion The results of this study indicated there is the same tendency of change in concentration of 14 C in teeth and previously reported human tissue and plant. Also there is same variation in concentration of 14 C in both Chinese and Japanese teeth; it also correlates with the numbers of atmospheric testing of nuclear weapons in the world. |
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